I am using JavaScript Client object model to get rootWeb and check permissions of current user. So I have used ExecuteOrDelayUntilScriptLoaded in my MasterPage to wait for sp.js. The problem is when I go to some pages for example AllItems.aspx (click a document library) sp.js is not loaded and my funcition will not be fired. I tried to set onDemond for sp.js to false but I got many other "Undefinde or object is null" errors. is there any solution for that? do I need to set ondemond for all javascripts to false?